* window.c (delete_all_subwindows): Save the window's buffer in

* window.c (delete_all_subwindows): Save the window's buffer in
	its `height' field; we may need to know the window's old buffer
	once we have restored it from a window configuration.
	Fset_window_configuration): When we restore a window, if its
	`height' field is a buffer, restore its `buffer' field from that.
	This allows us to leave the window's buffer unchanged if the
	buffer recorded in the configuration is dead.

	* window.c (delete_all_subwindows): Removed unused variable named
	"count".